internal server error during update to piwik 2.0.3 (4 replies)

Hello.
I have problem when im updating piwik to 2.0.3 (from 1.12) i have internal server error.
In error_log i have:

[20-Feb-2013 23:20:58] PHP Warning: array_key_exists() [<a href='function.array-key-exists'>function.array-key-exists</a>]: The second argument should be either an array or an object in /home/q70794qf/public_html/statystyki.-my-site-.pl/modules/base/templates/options_goal_entry.php on line 256

I was searching on the forum but i haven't found any ideas.